leave 5 , now multiply the first part of that no with (first part+1). put 5^2 or 25 after the result of multiplication
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EX:-
45^2= (4*5) 25=2025
265^2= (26*27) 25=70225
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EX:-
45^2= (4*5) 25=2025
265^2= (26*27) 25=70225
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